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Zeroize tmp bufs in entropy.c functions

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This commit is contained in:
Andres Amaya Garcia 2017-06-26 09:58:59 +01:00
parent eb132b655c
commit 1adcd95a25
1 changed files with 20 additions and 10 deletions
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30
library/entropy.c
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@ -242,7 +242,7 @@ static int entropy_gather_internal( mbedtls_entropy_context *ctx )
if( ( ret = ctx->source[i].f_source( ctx->source[i].p_source,
buf, MBEDTLS_ENTROPY_MAX_GATHER, &olen ) ) != 0 )
{
return( ret );
goto cleanup;
}
/*
@ -256,9 +256,12 @@ static int entropy_gather_internal( mbedtls_entropy_context *ctx )
}
if( have_one_strong == 0 )
return( MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE );
ret = MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE;
return( 0 );
cleanup:
mbedtls_zeroize( buf, sizeof( buf ) );
return( ret );
}
/*
@ -370,6 +373,8 @@ int mbedtls_entropy_func( void *data, unsigned char *output, size_t len )
ret = 0;
exit:
mbedtls_zeroize( buf, sizeof( buf ) );
#if defined(MBEDTLS_THREADING_C)
if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
@ -393,9 +398,9 @@ int mbedtls_entropy_update_nv_seed( mbedtls_entropy_context *ctx )
/* Manually update the remaining stream with a separator value to diverge */
memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
mbedtls_entropy_update_manual( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE );
ret = mbedtls_entropy_update_manual( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE );
return( 0 );
return( ret );
}
#endif /* MBEDTLS_ENTROPY_NV_SEED */
@ -421,12 +426,15 @@ int mbedtls_entropy_write_seed_file( mbedtls_entropy_context *ctx, const char *p
ret = 0;
exit:
mbedtls_zeroize( buf, sizeof( buf ) );
fclose( f );
return( ret );
}
int mbedtls_entropy_update_seed_file( mbedtls_entropy_context *ctx, const char *path )
{
int ret = 0;
FILE *f;
size_t n;
unsigned char buf[ MBEDTLS_ENTROPY_MAX_SEED_SIZE ];
@ -442,14 +450,16 @@ int mbedtls_entropy_update_seed_file( mbedtls_entropy_context *ctx, const char *
n = MBEDTLS_ENTROPY_MAX_SEED_SIZE;
if( fread( buf, 1, n, f ) != n )
{
fclose( f );
return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR );
}
ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR;
else
ret = mbedtls_entropy_update_manual( ctx, buf, n );
fclose( f );
mbedtls_entropy_update_manual( ctx, buf, n );
mbedtls_zeroize( buf, sizeof( buf ) );
if( ret != 0 )
return( ret );
return( mbedtls_entropy_write_seed_file( ctx, path ) );
}